Is true iff T can and (for performance reasons) should be passed by value.
@kinke: "The builtin __argTypes is (currently) only used/populated for Posix x64 (and AArch64 for LDC), and not used by GDC at all AFAIK".
https://github.com/dlang/dmd/pull/11000
https://github.com/dlang/dmd/pull/11000#issuecomment-671103778
See Implementation
Is true iff T can and (for performance reasons) should be passed by value.
@kinke: "The builtin __argTypes is (currently) only used/populated for Posix x64 (and AArch64 for LDC), and not used by GDC at all AFAIK".